A printed circuit board (PCB) mechanically supports and
electrically connects electronic components or electrical
components using conductive tracks, pads and other features etched
from one or more sheet layers of copper laminated onto and/or
between sheet layers of a non-conductive substrate. Components are
generally soldered onto the PCB to both electrically connect and
mechanically fasten them to it.

Printed circuit boards are used in all but the simplest electronic
products. They are also used in some electrical products, such as
passive switch boxes.

Alternatives to PCBs include wire wrap and point-to-point
construction, both once popular but now rarely used. PCBs require
additional design effort to lay out the circuit, but manufacturing
and assembly can be automated. Specialized CAD software is
available to do much of the work of layout. Mass-producing circuits
with PCBs is cheaper and faster than with other wiring methods, as
components are mounted and wired in one operation. Large numbers of
PCBs can be fabricated at the same time, and the layout only has to
be done once. PCBs can also be made manually in small quantities,
with reduced benefits.

PCBs can be single-sided (one copper layer), double-sided (two
copper layers on both sides of one substrate layer), or multi-layer
(outer and inner layers of copper, alternating with layers of
substrate). Multi-layer PCBs allow for much higher component
density, because circuit traces on the inner layers would otherwise
take up surface space between components. The rise in popularity of
multilayer PCBs with more than two, and especially with more than
four, copper planes was concurrent with the adoption of surface
mount technology.

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